Jacob s



(ModeL) J. S. AY'DELOTT.

Patentd'July 24, 1883.

WWW.

n. PETERS, Pm: Lilhompher, Washington. nc.

I UNITED STATES PATENT ()rricn.

moon s. AYDELOTT,

OF XENIA, INDIANA.

LOCK.

SPECIFICATION forming part of Letters Patent No. 281,822, dated July 24, 1883.

Application filed February 16, 1883. (Model.)

To all whom it may concern:

Be it known that I, J A0013 S. AYDELOTT, a citizen of the United States, residing at Xenia, in the county of Miami and State of Indiana, have invented certain new and useful Improvements in Burglar-Proof Looks, of which the following is a specification, reference being had therein to the accompanying drawmgs.

My invention relates to an improvementin burglar-proof locks; and it consists, first, in the combination of the frame hrving a suitable slot, that is notched at each of its ends upon its inner side, a pivoted plate which covers the key-hole, and a suitable locking device for locking the plate in position; second, in the combination of the pivoted plate for closing the key-hole, and which is provided with a locking device, a frame provided with a slot having a notch at each end, and the latch-bolt provided with a shoulder behind which the end of the plate is made to catch, as will be more fully described hereinafter.

The object of my invention is to provide a burglar-proof lock in which there is a plate for covering the key-hole, so that no key or other device can be inserted from the outside, and in which both the knob-bolt and thelocking-bolt are locked in position.

Figure 1 is a side elevation of my invention complete. Fig. 2 is a side view of the key alone.

A represents the frame of the lock, which has a curved slot, 1), made through that side which comes next to the room in which it is placed. This slot has a suitable recess or notch, 0, formed at each of its ends for the lockingcatch to catch in. Pivoted in the lower part of the frame, at D, is the plate E, which serves the twofold purpose of closing the keyhole from the inner side of the frame, so that no key or other tool can be inserted from the outside, and of locking the bolt F in position, so that it cannot be operated by the knob. In order to hold this locking-plate in position at either end of the slot B, it is provided with a small knob or handle, a, which projects through the slot, and with a suitable spring catch or bolt, 0, which catches in the knob at either end of the slot. hen this plate is raised in an upright position, it closes the key-hole and locks the bolt F by catching against a shoulder formed on its under side. WVhen this plate is turned backward, as shown in dotted lines, the key-hole is left exposed and the bolt F is unlocked, so that the bolt can be freely operated by the knob. This bolt F has the follower H placed in an opening, U, that is made through its inner end, and the bolt is automatically returned to place, after having been moved by the knob, by means of a spring, I, which bears against its rear end. This spring I extends forward just under the key-hole, and has fastened to its front end a connecting-rod, K, which has its lower end pivoted to the locking device L. This locking device is pivoted upon the same pivot as the locking-plate, and also has asnit able spring, N, placed under its front end, which is provided with a' projection, O, for catching in the recesses 1 formed in the lower edge of the locking-bolt Q. While this projection catches in one of the recesses in the lower edge of the locking-bolt, which it will do automatically whenever the bolt is moved forward or back by the key, the bolt is locked in place, so that it cannot be moved by any other key .than the one which was designed for the lock. The key shown in Fig. 2. is provided with two prongs, R,which straddle over the spring as the key is inserted and turned around, and the part S, which comes between these two prongs, acts as a cam to press the spring down. \Vhen the spring is pressed down, the locking device is forced downward by the connecting-rod, so as to leave the bolt free to move, and then the part B catches against the small projections T upon the top of the recessed portion of the bolt and moves the bolt either forward or back.

The great advantage of this look consists in being provided with a device which not only closes the key-hole, but also looks the knobbolt, so that, even if the key should be lost, the door will be securely locked and the key,- hole guarded, so that no key or other device can be inserted into the lock for the purpose of picking it.

Having thus described my invention, I

claim 1. lhe combination,with the frame provided with a shoulder, behind which the end of the with a slot having a notch at each end, of the plate is made to catch, substantially as shown pivoted locking-plate that is provided with a and described. catch for catching in either of the notches and In testimony whereof I affix my signature in 5 looking the plate in position over thekey-hole, presence of two witnesses.

substantially as described. 7" i r 2. In a lock, a pivoted plate for closing the JACOB A1 DELOTD' key-hole, and provided with a locking device, Vitnesses: a, a frame provided with a slot having anotoh, 1 JOHN L. PETEns, 1

10 O, at each end, and the latch-bolt F, provided I F. XV. AYDnLo'r'r. 

